I was a bit dubious as to how effective it might be when I first heard about it, but I now know of two local incidents where the police visited the homes of 'driving prats' after they were reported (one had been captured on go-pro, driving by on the other side of the road, fast, while sounding their horn!), the other involved three riders who corroborated the incident (driving by too close and fast) - so it seems to work.
I am not aware of one.
An upside of personalised plates is that they are usually easier to remember!